Upgrade dependencies, build with Node 16

[adidahiya]

Changes proposed

• Build with Node 16 in CI, using new modern CircleCI images
• Fix preview comment script (borrowing from chore: fix PR preview comment artifact links blueprint#5208)
• Upgrade dependencies
  • TypeScript -> v4.6
  • ts-node -> v10.0 (changelog)
  • typedoc -> v0.22 (changelog)
    • decided to postpone this upgrade, dealing with the breaking changes related to loading TS projects took too long... we should probably start using the new workspaces feature in TypeDoc anyway
  • marked -> v4.0 (changelog)
• Add --tsconfigPath CLI option to documentalist compiler, to make working with the new TypeDoc API easier
• The NPM plugin is now a bit simpler as a synchronous compilation process (replaced spawn with spawnSync)
• TypeDoc's reflection flag isExported will be removed in a future version, and TypeDoc will only document exported members. Therefore, we're removing he includeNonExportedMembers option from the documentalist TS plugin.
  • N.B. we weren't using this in Blueprint anyway.

TypeDoc breaking changes that had to will have to be addressed in upgrading from v0.19 -> v0.22:

• TypeDoc's handling of accessor documentation changed. It no longer includes combined JSDoc content for get+set accessors in the documentation field; the content is split into getDocumentation and setDocumentation fields (as it was previously). See updated test snapshots for the details.
• ignoreCompilerErrors is being removed, and it seems like we were relying on this to get TS docs built. We'll have to implement a workaround, possibly using the snippet from Support for ignoreCompilerErrors TypeStrong/typedoc#1403 (comment)

[blueprint-bot]

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